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Avast 2014 firewall is also hiding (making unavailable) networked TV Tuners (Silicone Dust) to windows 7 Media center.
I have all the exclusions set correctly and double checked also. This worked great in previous AVAST for over a year. Update to AVAST 2014 (and confirmed settings) and no TV tuner for live or to record. If you force / fix things it only works for a short while and they are not available again.
Restore point before AVAST 2014 upgrade seemed to work but then AVAST 8 said no license and couldn’t start shields to I had to apply an image from before AVAST 2014 upgrade.
Seems the New firewall in AVAST 2014 has some major issues compared to the prior version.